'use strict'

const tap = require('tap')
const silentConsole = {
  log() {},
  error() {}
}
require('../common')
const assert = require('assert')
const stream = require('../../lib/ours/index')
const Writable = stream.Writable

// Test the buffering behavior of Writable streams.
//
// The call to cork() triggers storing chunks which are flushed
// on calling end() and the stream subsequently ended.
//
// node version target: 0.12

const expectedChunks = ['please', 'buffer', 'me', 'kindly']
const inputChunks = expectedChunks.slice(0)
let seenChunks = []
let seenEnd = false
const w = new Writable()
// Let's arrange to store the chunks.
w._write = function (chunk, encoding, cb) {
  // Stream end event is not seen before the last write.
  assert.ok(!seenEnd)
  // Default encoding given none was specified.
  assert.strictEqual(encoding, 'buffer')
  seenChunks.push(chunk)
  cb()
}
// Let's record the stream end event.
w.on('finish', () => {
  seenEnd = true
})
function writeChunks(remainingChunks, callback) {
  const writeChunk = remainingChunks.shift()
  let writeState
  if (writeChunk) {
    setImmediate(() => {
      writeState = w.write(writeChunk)
      // We were not told to stop writing.
      assert.ok(writeState)
      writeChunks(remainingChunks, callback)
    })
  } else {
    callback()
  }
}

// Do an initial write.
w.write('stuff')
// The write was immediate.
assert.strictEqual(seenChunks.length, 1)
// Reset the seen chunks.
seenChunks = []

// Trigger stream buffering.
w.cork()

// Write the bufferedChunks.
writeChunks(inputChunks, () => {
  // Should not have seen anything yet.
  assert.strictEqual(seenChunks.length, 0)

  // Trigger flush and ending the stream.
  w.end()

  // Stream should not ended in current tick.
  assert.ok(!seenEnd)

  // Buffered bytes should be seen in current tick.
  assert.strictEqual(seenChunks.length, 4)

  // Did the chunks match.
  for (let i = 0, l = expectedChunks.length; i < l; i++) {
    const seen = seenChunks[i]
    // There was a chunk.
    assert.ok(seen)
    const expected = Buffer.from(expectedChunks[i])
    // It was what we expected.
    assert.ok(seen.equals(expected))
  }
  setImmediate(() => {
    // Stream should have ended in next tick.
    assert.ok(seenEnd)
  })
})

/* replacement start */
process.on('beforeExit', (code) => {
  if (code === 0) {
    tap.pass('test succeeded')
  } else {
    tap.fail(`test failed - exited code ${code}`)
  }
})
/* replacement end */
